undefined is not an object (eval

我的职业生涯，差点因此而毁灭，差点坚持不下去😂，看了将近两天，这个bug

修复方法：

1.package.json
"dependencies": {

    "babel-plugin-transform-flow-strip-types": "^6.22.0",

  },

2.babelrc

{

  "presets": ["module:metro-react-native-babel-preset"],

  "plugins": [

    ["@babel/plugin-transform-flow-strip-types"],

    ["@babel/plugin-proposal-decorators", { "legacy": true }],

    ["@babel/plugin-proposal-class-properties", { "loose": true }],

    ["@babel/transform-runtime", {

      "helpers": true,

      "regenerator": false

    }]

  ]

参考链接：https://github.com/facebook/react-native/issues/20588